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arXiv 1109.6507cond-mat.supr-connlin.CDnlin.PSnlin.SI
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带负载的确定性约瑟夫森涡旋棘轮

Deterministic Josephson Vortex Ratchet with a load

M. Knufinke, K. Ilin, M. Siegel, D. Koelle, R. Kleiner, E. Goldobin

摘要:

实验研究了确定性欠阻尼约瑟夫森涡旋棘轮--磁通粒子在非对称周期势场中沿约瑟夫森结运动。通过施加正弦驱动电流,可以迫使涡旋沿某一方向移动,从而在结上产生平均直流电压。在这样一个纠正制度,我们也加载棘轮,即,施加额外的DC偏置电流I_dc(反作用力),其使电势倾斜,使得磁通量由于棘轮效应而向上爬升。磁通停止上升时的偏置电流值定义了棘轮效应的强度,并通过实验确定。这使我们能够估计棘轮的负载能力、输出功率和效率。对于准静态制度,我们提出了一个简单的模型,提供了简单的分析表达式,上述数字的优点。

英文摘要:

We investigate experimentally a deterministic underdamped Josephson vortex ratchet -- a fluxon-particle moving along a Josephson junction in an asymmetric periodic potential. By applying a sinusoidal driving current one can compel the vortex to move in a certain direction, producing average dc voltage across the junction. Being in such a rectification regime we also load the ratchet, i.e., apply an additional dc bias current I_dc (counterforce) which tilts the potential so that the fluxon climbs uphill due to the ratchet effect. The value of the bias current at which the fluxon stops climbing up defines the strength of the ratchet effect and is determined experimentally. This allows us to estimate the loading capability of the ratchet, the output power and efficiency. For the quasi-static regime we present a simple model which delivers simple analytic expressions for the above mentioned figures of merit.

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